package com.yuqing.sentimentapp.utils;

import android.app.AppOpsManager;
import android.content.Context;
import android.content.pm.ApplicationInfo;
import android.os.Build;

import java.lang.reflect.Field;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;

/**
 * Created by hqd on 2018/3/16.
 */

public class NotificationsUtils {

    private static final String CHECK_OP_NO_THROW = "checkOpNoThrow";
    private static final String OP_POST_NOTIFICATION = "OP_POST_NOTIFICATION";

    public static boolean isNotificationEnabled(Context context) {

        AppOpsManager mAppOps = null;
        if (android.os.Build.VERSION.SDK_INT >= android.os.Build.VERSION_CODES.KITKAT) {
            mAppOps = (AppOpsManager) context.getSystemService(Context.APP_OPS_SERVICE);
        }
        ApplicationInfo appInfo = context.getApplicationInfo();
        String pkg = context.getApplicationContext().getPackageName();
        int uid = appInfo.uid;

        Class appOpsClass = null;
    /* Context.APP_OPS_MANAGER */
        try {
            if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.KITKAT) {
                appOpsClass = Class.forName(AppOpsManager.class.getName());
            }else {
                return false;
            }
            Method checkOpNoThrowMethod =
                    appOpsClass.getMethod(
                            CHECK_OP_NO_THROW,
                            Integer.TYPE,
                            Integer.TYPE,
                            String.class
                    );
            Field opPostNotificationValue = appOpsClass.getDeclaredField(OP_POST_NOTIFICATION);
            int value = (int) opPostNotificationValue.get(Integer.class);

            return (
                    (int) checkOpNoThrowMethod.invoke(mAppOps, value, uid, pkg) ==
                            AppOpsManager.MODE_ALLOWED);

        } catch (ClassNotFoundException e) {
            e.printStackTrace();
        } catch (NoSuchMethodException e) {
            e.printStackTrace();
        } catch (NoSuchFieldException e) {
            e.printStackTrace();
        } catch (InvocationTargetException e) {
            e.printStackTrace();
        } catch (IllegalAccessException e) {
            e.printStackTrace();
        }
        return false;
    }
}
